Details for: CL0000068

Cell ID: CL0000068

Cell Name: duct epithelial cell

Description: An epithelial cell that is part of a duct.

Selected Context(s): Overall

Gene Significance Landscape

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Score:
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Genes

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Cell Significance Index (CSI) is uniquely calculated to reveal cell-specific gene markers. More info here

Significant Genes List

Genes with the highest and lowest Percentile Rank Scores (PRS) for duct epithelial cell within the selected context(s).

Gene ID: A unique numerical identifier for this specific gene.
Symbol: Shortened abbreviation or name that represents this gene.
Ensembl Gene ID: A unique identifier assigned by Ensembl for genomic data mapping.
CSI Score: A combined effect size and statistical significance measure for duct epithelial cell. Higher scores indicate a stronger, more significant difference in expression.
(Previously described as "Fold Change", but now represents Cliff's Delta × –log10(p).)

Gene ID: A unique numerical identifier for this specific gene.
Symbol: Shortened abbreviation or name that represents this gene.
Ensembl Gene ID: A unique identifier assigned by Ensembl for genomic data mapping.
CSI Score: A combined effect size and statistical significance measure for duct epithelial cell. Higher scores indicate a stronger, more significant difference in expression.
Average CSI: csi sum / gene count
Cell network configuration

This network visualizes key genes for duct epithelial cell. It primarily includes:
1. Top genes highly significant for this cell (Num. Top Cell Genes - based on the 'Min. CSI' setting).
2. Any additional specific 'Context Genes' you add below.
The final network is a combined view. Choose an Interaction Source (pathways or protein interactions) and optionally compare CSI scores with a Baseline Cell Type.

Maximum number of selected genes.
Select a context for the baseline cell.
Select a context for the target cell.
Target Cell for CSI:  duct epithelial cell (CL0000068)

 Legend
Nodes (Genes):
 Query Gene
Node size also reflects Target Cell CSI magnitude.
Node Color (Target Cell CSI in specific network):
 Very High
 High
 Medium
 Low
 Very Low
 N/A or Not Sig.
Edges (Interactions):
 STRING (Protein-Protein)
 ONTOLOGY (Shared Pathway)
 Colors vary by pathway category; default arrow applies.

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## Summary The [duct epithelial cell](/details-cell/CL0000068) is a specialized epithelial cell that forms the lining of ducts. Based on gene significance analysis, this cell type is characterized by an exceptionally high and specific expression of genes related to mitochondrial energy production, suggesting a primary role as a metabolic powerhouse. This intense bioenergetic activity likely fuels crucial functions such as active transport for secretion, detoxification, and mucosal immunity. The top marker genes, including numerous components of the electron transport chain like '[COX2](/details-gene/4513)' and '[COX1](/details-gene/4512)', alongside genes for polyamine metabolism ([SAT1](/details-gene/6303)) and immunoglobulin transport ([PIGR](/details-gene/5284)), collectively define the [duct epithelial cell](/details-cell/CL0000068) as a highly active and specialized barrier and secretory cell. ## Key Characteristics and Function **Overall**, the gene expression profile of the [duct epithelial cell](/details-cell/CL0000068) is dominated by genes essential for cellular bioenergetics and specialized transport functions. The high Z-score CSI values for these markers indicate their expression is highly specific, serving as a defining molecular signature for this cell type. * **Mitochondrial Respiration and Energy Metabolism:** The most prominent characteristic is the extraordinarily high specificity of numerous mitochondrial genes. This includes key subunits of the electron transport chain such as Cytochrome c oxidase ([COX1](/details-gene/4512), [COX2](/details-gene/4513), [COX5B](/details-gene/1329), [COX7A2](/details-gene/1347), [COX7C](/details-gene/1350)), NADH dehydrogenase ([ND1](/details-gene/4535), [ND2](/details-gene/4536), [ND4](/details-gene/4538), [ND5](/details-gene/4540)), Cytochrome b ([CYTB](/details-gene/4519)), and ATP synthase ([ATP5F1E](/details-gene/514), [ATP6](/details-gene/4508)). This genetic signature strongly suggests that duct epithelial cells have a massive energy demand, consistent with their primary physiological roles in active ion and fluid transport, which are ATP-dependent processes. * **Polyamine and Iron Metabolism:** The top-ranked specific marker, [SAT1](/details-gene/6303) (spermidine/spermine N1-acetyltransferase), is the rate-limiting enzyme in polyamine catabolism, a pathway critical for cell proliferation, differentiation, and apoptosis ([Link](https://doi.org/10.1016/s0021-9258(17)35245-6)). Its high specificity may indicate tight regulation of these processes in ductal structures. Furthermore, the high significance of [FTH1](/details-gene/2495) (Ferritin Heavy Chain 1) points to a significant role in iron sequestration, which is vital for managing oxidative stress generated by the high metabolic rate. * **Secretory Immunity and Barrier Function:** A key functional marker is [PIGR](/details-gene/5284), the polymeric immunoglobulin receptor. Its high specificity confirms the role of duct epithelial cells in mucosal immunity by transporting polymeric IgA and IgM across the epithelium into luminal secretions. This process, known as transcytosis, is a cornerstone of the mucosal defense system. The presence of [B2M](/details-gene/567), a component of MHC class I molecules, further suggests a capacity for antigen presentation to the immune system. * **Detoxification and Stress Response:** The specific expression of [GSTP1](/details-gene/2950) (Glutathione S-transferase Pi 1) indicates a robust capacity for cellular detoxification by conjugating glutathione to a wide range of xenobiotics and endogenous compounds. This protective function is likely crucial for cells lining ducts, which can be exposed to metabolic byproducts and external substances. * **Cellular Identity:** The anti-markers provide clarity on what this cell is not. The low significance of keratins associated with stratified epithelia, such as [KRT5](/details-gene/3852) and [KRT6B](/details-gene/3854), reinforces the identity of these cells as part of a simple (non-stratified) epithelial layer, distinct from cell types found in the epidermis. ## Clinical Significance and Contextual Roles The analysis, performed in an **Overall** context, highlights fundamental properties of [duct epithelial cells](/details-cell/CL0000068) that have significant clinical implications. Without a direct comparison to a disease state, we can infer potential vulnerabilities and roles based on this baseline profile. The profound reliance on oxidative phosphorylation makes these cells potentially vulnerable to mitochondrial dysfunction, a hallmark of many metabolic diseases and age-related pathologies. Genetic defects in mitochondrial genes like [ND4](/details-gene/4538) or [CYTB](/details-gene/4519) can lead to severe systemic disorders, and their specific high expression in ductal cells could contribute to organ-specific manifestations of such diseases. For example, a mutation in [CYTB](/details-gene/4519) has been implicated in fatal cardiomyopathy ([Link](https://doi.org/10.1007/bf00711378)). The high specificity of detoxification ([GSTP1](/details-gene/2950)) and iron-storage ([FTH1](/details-gene/2495)) genes suggests these cells are on the front line of managing chemical and oxidative stress. In chronic inflammatory conditions or exposure to toxins, the capacity of these systems may be overwhelmed, leading to cellular damage, impaired ductal function (e.g., in cystic fibrosis or chronic pancreatitis), and potentially contributing to carcinogenesis. The specific expression of [ITM2B](/details-gene/9445), a gene associated with familial British and Danish dementias through amyloid peptide formation ([Link](https://doi.org/10.1038/21637)), is noteworthy. While the primary pathology of these diseases is neurological, its high specificity in ductal cells is an intriguing finding that may suggest a yet-unexplored peripheral aspect of these proteinopathies or a shared molecular vulnerability. ## Potential Mechanisms and Research Directions 1. **Hypothesis: Duct epithelial cells function as 'Metabolic Gatekeepers,' where their high bioenergetic state is a critical requirement for maintaining organ-specific fluid and protein secretion, making them highly susceptible to metabolic insults.** * **Surprising Findings:** The sheer number and extreme specificity (many `csi_z` scores > 60) of mitochondrial electron transport chain components are remarkable. This suggests that high-level aerobic respiration is not just a supportive function but rather the central, defining feature of this cell's identity and function, likely surpassing many other cell types in its demand for ATP. * **Testable Questions:** How does targeted inhibition of mitochondrial complex I (e.g., using rotenone) or complex IV (e.g., using azide) specifically affect the secretory functions of duct epithelial cells, such as IgA transcytosis via [PIGR](/details-gene/5284) or ion transport, in an ex vivo organoid model? 2. **Hypothesis: The polyamine pathway, marked by high [SAT1](/details-gene/6303) expression, is directly linked to the regulation of mucosal immunity and cellular turnover in ductal systems.** * **Surprising Findings:** The co-occurrence of [SAT1](/details-gene/6303), the rate-limiting enzyme in polyamine catabolism, and [PIGR](/details-gene/5284), a key component of secretory immunity, as highly specific markers is unexpected. This suggests a potential regulatory crosstalk between cellular polyamine levels and the execution of mucosal defense mechanisms. * **Testable Questions:** Does the pharmacological inhibition of [SAT1](/details-gene/6303) activity in a polarized ductal cell monolayer alter the expression, cellular localization, or transport efficiency of the [PIGR](/details-gene/5284) receptor in response to inflammatory stimuli like interferons or bacterial components?